docs: def seq(self):
          """Seq: Get the Seq object from the sequence file, metadata file, or in memory"""
  
          if self.sequence_file:
              log.debug('{}: reading sequence from sequence file {}'.format(self.id, self.sequence_path))
              tmp_sr = SeqIO.read(self.sequence_path, 'fasta')
              return tmp_sr.seq
  
          elif self.metadata_file:
              log.debug('{}: reading sequence from metadata file {}'.format(self.id, self.metadata_path))
              tmp_sr = SeqIO.read(self.metadata_path, 'uniprot-xml')
              return tmp_sr.seq
  
          else:
              if not self._seq:
                  log.debug('{}: no sequence stored in memory'.format(self.id))
              else:
                  log.debug('{}: reading sequence from memory'.format(self.id))
  
              return self._seq